Mold for casting metal.



R. T. HARRIS.

MOLD FOB CASTING METAL.

APPLICATION rum) JAR. 11, 1am. nmmwnn our. 11, 1011. 1,017,970.

Patented Feb. 20, 1912.

Inventor. A Rbm'fiifilwuub,

Attorney.

I Witnesses. 1

'BO 33 I R. T. HARRIS.

MOLD FOB CASTING METAL.

uruouronrnnn JAN. 11 mo. Bnnwnn 001*.11,1o11.

Patented Feb. 20, 1912.

3 SHEETS-SHEET 3.

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Ram?! 540M. Inventor.

UNITED STATES PATENT OFFICE.

REES E T. HARRIS, OF BUFFALO, NEW YQRK.

MOLD FOR CASTING METAL.

Specification of Letters Patent.

. 7 Application filed January 11, 1910, Serial No. 537,521. RenewedOctober 11, 1911. Serial No. 654,162.

To all whom it may concern:

Be it known that I, REESE T. HARRIS, a citizen of the United States,residing at Buffalo, in the county of Erie and State of New York, haveinvented a certain new and useful Improved Mold for Casting Metal, ofwhich the following is a specification.

This invention relates to improvements in molds used in casting metals,and principally to the collapsible construction of a metallic core.

The main object of. the invention is to materially reduce the cost ofproducing molds'and castings by dispensing with the usual green sandcore and in lieu thereof utilizing a permanent collapsible metal corewhich may be easily withdrawn from the casting.

The invention also relates to certain details of construction of themold and the metal core, which will be hereinafter described andclaimed, reference being had to the accompanying drawings in which,-

Figure 1 is a transverse section through the mold. Fig. 2 is atransverse section through the mold similar to Fig. 1, but includingthemetal casting and illustrating the metal core-partially withdrawn fromthe mold. Fig. 3 is a top plan view of the improved mold. Fig. 4 is acentral longitudinal section through the mold on line a a, Fig. 1. Fig.5 is a fragmentary horizontal longitudinal section through the mold online b 'b, Fig.- 4. Fig. 6 is a transverse section through the woodenpattern.

In referring to the drawings in detail like numerals designate likeparts.

This improved mold is chiefly designed to be used in casting chargingboxes and the like, and briefly it consists of a drag, a pattern and acollapsible metal element which forms both the cope and core.

The drag has a flask 1 and a wooden pattern 2 which forms the exteriorcontour of the metal casting and is fitted in the flask 1 in the usualmanner. Green sand is then tamped into the flask around the pattern tosecure the imprint of the sides of the pattern and form the. lower greensand portion 3 of the mold. The interior contour of the box is formed bya metal element which is fitted on the flask 1 after the mold portion 3is completed and-the wooden pattern 2 is withdrawn. This metal elementis preferably constructed of two parts or members wh1ch are hingedtogether so that they can collapse or fold together. The members arepractically similar in size and shape butextend oppositely and areopposed to each other so that when in open position the metal elementwill be of a dished or barrel like form, or a hollow or troughlikestruc-' ture. The members each consist .of a lower ap11)roX-1matelyhorizontal inwardly extending portion 4;, a vertical medial portion 5and a horizontal outwardly extending top flangeportion 6.

The hinges for connecting the members consist of lugs 7 which extend upfrom the top surfaces of thc horizontal portions 4;

near the inner margins thereof and lap each other, and hinge pintlesSwhich are loosely fitted through eye openings in the lugs. Two hingeseach consisting of three lugs anda pintle are preferably utilized, eachof which is located near one end of the metal element. i

It will be noted that the junction of th lower horizontal portion 4 andthe medial vertical portion 5 is of a rounded form.

The object of this is to give a similar rounding contour to the interiorof the casting and Patented Feb. 20, 1912.

also to enable the members of the metal elev ment to be easily turned ontheir hinges and withdrawn from the casting.

When the metal element is in position to form the interior contour ofthe casting as shown in Fig. 1, the lower inner edges of its membersbutt closely together, so that an extremely smooth and practicallyunbroken surface is presented to the molten metal as it flows in.

The hinges are located within the metal element-above the bottom surfacethereof,

and are thus thoroughly and completely protected from contact with themolten metal as the casting is poured.

The metal element is collapsed and with drawn after the molten metal ispoured in the mold by means of a crane or other suitable machine (notshown) from which lifting hooks 9 depend. A fragment of one of the hooks9 is shown in dotted lines in Fig. 2.

The two members of the metal element or core are held in their separatedposition as 1 shown in Fig, 1, by bridge bars 10 which extendtransversely between members and are connected at their respective endsto the members by pins 11, which pass through holes 12 in the bridgebars:- and holes 13 in raised cross ribs 14 on the top flanged portionsof the members. Each bridge bar has a central upwardly extending lug 15which is provided with an opening 16 in which one of the hooks 9 engage.Each of the bridge bars is additionally connected to one of the membersof the metal element or core by a link 17 which is pivoted at its innerend by a pin 18 to the bridge bar at a point vertically below theopening 16 in the lug 15, see Fig. 1. The outer end of the linkispivoted by a pin 19 to aninwardly projectmg lug 20 located near the topof the vertical medial portion 5 of one of the members.

The members of the metal element or core are each stiflened andstrengthened on their inner surface by longitudinal and transverse ribs21 and 22. The ends of the core are closed by end pieces which areformed of sand inserted in place between the end margins of the membersof the metal element or core in their separated position, as in Fig. 1.

As the charging box designed to be cast with the form of the inventionshown in the accompanying drawings has a slotted end and a plain end,one of the end pieces is formed in two separated sections 23 and 24:

, which are fitted together as shown in Fig.

5 and shaped to leave the necessary slot in the slotted end and theother in one solid piece 25.

The pouring hole 26 is located at one end of the sand portion 3 of themold and the vent hole 27 at the opposite end of said sand portion.

This mold is utilized chiefly for casting thin, narrow elongated piecesof dished form which are difficult to cast with ordinary sand cores andractically impossible to cast with solid meta cores.

In forming this improved mold the wooden pattern 2 is first placed inthe flask 1 and green molding sand is then rammed into the space betweenthe flask and pattern to form the lower sand portion 3 of the mold. Thepattern is now withdrawn and the metal element or core is fitted on theflask and the sand end pieces placed in the ends of the metal element orcore. The mold is now complete ready for pouring. The molten metal ispoured in the pouring hole 26 until it runs out of the vent 27 at theopposite end. After the castin is poured, the metal element is quicklywit drawn in the following manner. Each of the bridge bars isdisconnected from the rib 14 of one of the members linked thereto byremoving the pins 11 and the metal element is collapsed and lifted fromthe casting by the hooks 9 in the manner shown in Fig. 2. The collapsingofthe metal element also breaks up the sand end pieces of the core, sothat the casting when sufficiently cooled can be easily removed from thelower sand portion 3 of the mold.

But one flask is required with this construction as the metal elementserves not only as a core and a cope but also as the entire top portionof the mold. The advantages of this are that it is not necessary to waitfor the casting tocool before removing the core, nor to knock the coreout as with a sand core, that the casting is permitted to freelycontract while cooling owing to the removal of the metal element whichprevents distortion or cracking of the casting, and that owing to thepermanent character of the metal element, the molding and castingoperations are essentially quicker and cheaper than with the ordinarysand core and the resulting casting is even and uniform.

The wooden pattern 2 is provided on its bottom with two parallellongitudinal ribs 28 which press channels 29 in the surface of the lowersand portion of the mold. These channels constitute gates for theflowing molten metal and also serve to form corresponding parallellongitudinal ribs 30 on the bottom of the casting. After the woodenpattern is removed converging grooves or channels 31 are formed whichextend from the ends of the channels 29 to the pouring hole or gate.

The flask and metal core are pinned to each other so that they willregister properly together. This is accomplished byproviding flanges 32or the like on the outer margins of the top portions of the flask sidesand providing such flanges with vertical pins which are adapted to enteropenings in the lateral extensions 34 of the metal core. End plates arefitted on the ends of the flask over the ends of the mold and are heldin place by weights or clamps. These plates serve to close the top endsof the flask as the core is not as long as the flask and also to preventthe sand from being forced out over the top of the molten metal as it ispoured in this improved mold is utilized is in the casting of chargingboxes from open hearth and Bessemer and other forms of steel anddirectly from the ladle, the iron being converted into steel and thencarried to and poured into the mold while still in a molten state.

The metal element or core is preferably constructed of cast iron and itis washed with a composition of graphite and fire clay or any othersuitable composition for producing a smooth non-adhesive surface tocontact with the molten metal.

The main advantages of this improved mold reside in its simplicity andquickness 'and ease of construction as it is only necessary to form thelower port-ionand the end pieces of the core of sand; in. the permanentcharacter of the mam portion of the core,

One of the principal purposes for whichand the expeditious manner inwhich the casting is formed and removed from the mold.

I claim:

1. Inamold for casting discharge boxes,a drag having a flask and asandmold portion and a collapsible combined core and cope on the flask overthe sand mold portion, said combined core and cope consisting of twoopposed metal sides movably connected to each other at their loweredges, and sand end pieces fitted between the ends of the sides.

.2. In a mold for casting metal, a drag having a flask and a sand moldportion and a collapsible element .on the flask over the sand moldportion which constitutes both a core and a cope, said collapsibleelement consisting of two side members of angular form in cross-sectionhinged to each other on the bottom and two sand end pieces which arefitted between the ends of the members and are adapted to be.crushed bythe movement of said side members toward each other: when the element iscollapsed.

3. In a mold forcasting metal, a drag having a flask and a sand moldportion and a collapsible element on the flask over the sand moldportion composed of two side members, a hinge for connecting said sidemembers together at their lower edges, said hinge being located withinthe collapsible element, and end pieces of friable material fittedbetween the ends of said members.

4. In a mold for casting metal, an outer mold portion of sand, and aninner core composed of metal sides hinged to each other, and end piecesfitted between the metal sides, said end pieces being formed of friablematerial and being adapted to be crushed by the collapsing of the sides.

5. In a mold for casting metal, an outer mold portion of sand, and aninner core composed of two angular hinged together metal side membersand sand end pieces fitted between the ends of the sides.

6. In a mold for casting'metal, a collapsible metal core consisting oftwo opposed metallic side members, and end pieces of friable materialfitted between the metallic side members.

7. In a mold for casting metal, a collapsible metal element consistingof two opposed slde members each composed of a lower inwardly extendinghorizontal portion, a vertical medial portion, and a top outwardlyextending flanged portion, and hinged means for connecting the lower"inwardly extending horizontal portions of said side members.

8. In a mold for casting metal, a'collapsible metal element consistingof opposed members each consisting of a lower inwardly extendinghorizontal portion, a vertical medial portlon, and a top outwardlyextending flange portion, a hingelug extendingfrom the lower horizontalportion of each member 7 and a hinge pintle loosely fitted in said lugs:

9. In a mold for casting metal, a collapsible metal element consistingof opposed members, hinge lugs extending from said members, hingepintles loosely fitted in said lugs and transverse bridge bars extendingacross the members.

. 10. In a mold for casting metal, a collapsible metal elementconsisting of opposed members each consisting of a lower inwardlyextending horizontal portion, a vertical medial portion and a topoutwardly extending flange portion, hinges connecting the lowerhorizontal portions and bridge bars extending transverselyacross andconnecting the top flange portions. I

11. In a mold for casting metal, a collapsible metal element consistingof opposed members each consisting of a lower inwardly extendinghorizontal portion, a vertical medial portion and a top outwardlyextending flange portion; said flange portion having top ribs and abridge bar extending across and pivoted to the ribs.

12. In a mold for casting metal, a collapsible metal element consistingof opposed members each consisting of a lower inwardly extendinghorizontal portion, a vertical medial portion and a top outwardlyextending flange portion; said flange portion having top ribs, a bridgebar extending across and pivoted to the ribs, and a link pivoted at oneend to. the center of the bridge bar and at the opposite end to one ofthe members.

13. In a mold for casting metal, a collapsible metal element consistingof opposed members each consisting of a lower inwardly extendinghorizontal portion, a vertical medial portion and a topoutwardlyextending flange portion; top ribs, a bridge bar extendingacross and pivoted to the ribs and a link pivoted at one end to thecenter of the bridge bar and at the opposite end to an interior lug onthe Eertical medial portion of one of the memers.

14.. In a mold for casting metal boxes, a drag having a hollowed-outsand portion and a flask around said sand portion in combination with ametal core consisting of angular side members. having lower inwardlyextending flanges and upper outwardly extending flanges, and a hingecon-. necting the lower inwardly extending flanges to each other.

15. In a mold for casting metal, a collapsible element consisting of ahollow or trough-like collapsible metal structure having open ends, andend pieces of friable material fitted in the open ends of saidcollapsible structure. y

16. In a mold for casting metal, a collapsible core consisting ofangular metallic side said flange portion having members and end piecesof friable material fitted between the ends of said members.

17. In a mold for casting metal, a collapsible core consisting ofhinged-together metallic side members of angular form in crosssection,and end pieces of friable material fitted between the ends of said sidemembers.

18. In a mold for casting metal, a transversely collapsible coreconsisting of metallic side members movably connected. to each other,and end pieces of friable material.

19. In a mold for casting metal, a collapsible core consisting of atransversely collapsible hollow or trough-like metal structure, and sandend pieces;

20. In a mold 'foricasting metal, a core havmg hinged-together metalsides and sand end pieces.

21. In a mold for casting an open box of the character described, thecombination with amatrix, of a core consisting of an open-endedtrough-like metallic structure formed with out-turned flanges bearing onthe top of the matrix, and separable end pieces closing the ends of saidstructure.

22. In a mold for casting an open box of nor-mm the character described,the combination with a' matrix, of a core consisting of an open-endedtrough-like collapsible metallic structure, oppositely disposed channelbarlike members, each having one edge hinged to the edges of the other,an arm pivotally connected at one end to one member, means.

for detachably securing the other end of the arm to the other member,and a link pivotally connected at one end to said arm and at the otherend to said other member; and supportable end pieces closing the ends ofsald structure.

23. In a moldfor casting an open box of the character described, thecombination with the matrix of a core consisting of an open endtrough-like collapsible metallic structure and separable end piecesclosing the ends of said structure, said end pieces being in the form ofmolded core parts and being seated in theends of said structure.

REESE T. HARRIS.

